67872817 has 4 divisors (see below), whose sum is σ = 67905396. Its totient is φ = 67840240.

The previous prime is 67872799. The next prime is 67872869. The reversal of 67872817 is 71827876.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32160241 + 35712576 = 5671^2 + 5976^2 .

It is a cyclic number.

It is not a de Polignac number, because 67872817 - 2¹⁹ = 67348529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67875817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12934 + ... + 17407.

It is an arithmetic number, because the mean of its divisors is an integer number (16976349).

Almost surely, 2^67872817 is an apocalyptic number.

It is an amenable number.

67872817 is a deficient number, since it is larger than the sum of its proper divisors (32579).

67872817 is a wasteful number, since it uses less digits than its factorization.

67872817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32578.

The product of its digits is 263424, while the sum is 46.

The square root of 67872817 is about 8238.4960399335. The cubic root of 67872817 is about 407.9108821922.

It can be divided in two parts, 6787 and 2817, that added together give a square (9604 = 98²).

The spelling of 67872817 in words is "sixty-seven million, eight hundred seventy-two thousand, eight hundred seventeen".